where Qn is the nth Pell-Lucas number. Proof. By definition of the matrix Un it can be contracted on first column. Let U(r) n be the rth contraction of Un. If r = 1, then
where Qn is the nth Pell-Lucas number.Proof. By definition of the matrix Un it can be contracted on first column.Let U(r)n be the rth contraction of Un. If r = 1, then